Miter box for portable power saws



Oct. 27, 1953 c. L. THAYER MITER BOX FOR PORTABLE POWER SAWS 3 Sheets-Sheet 1 Filed Feb. 15, 1952 INVENTOR Chester L. Thaqer @mam, m

ATTORNEYS Oct. 27, 1953 c. L. THAYER MITER BOX FOR PORTABLE POWER SAWS 3 Sheets-Sheet 2 Filed Feb. 15, 1952 INVENTOR Chester L. Thai er @dmwwmm ATTORNEYS Oct. 27, 1953 c. L. THAYER MITER BOX FOR PORTABLE POWER SAWS 3 Sheets-Sheet 5 Filed Feb. 15, 1952 INVENTOR Ches berL. Thaqer ATTORNEYS BY W Patented Oct. 27, 1953 UNITED STATES PATENT OFFICE MITER BOX FOR PORTABLE POWER SAWS Chester L. Thayer, Memphis, Tenn. Application February 15, 1952, Serial No. 271,699

2 Claims.

This invention relates to miter boxes for portable power saws and more particularly to such miter boxes which may be employed not only for cutting at various angles across the length of the material to be cut but may also be used for ripping along the length of the material to be cut.

Heretofore various devices have been proposed for holding portable power saws at various angles of cut across the length of material to be cut and also for ripping such material. These prior devices are for the most part complicated in construction and expensive to manufacture.

It is accordingly an object of the present invention to provide a novel miter box for portable power saws which is relatively simple to manufacture and of relatively cheap construction.

Another object of the present invention is to provide such a miter box which can be used for various angles of cut across the length of the material to be cut and which may also be used for ripping along the length of such material.

Another object is to provide such a novel miter box which may be adjusted for various thicknesses of out both across and along the length of the material to be out.

Another object is to provide such a novel miter box which is of such simple construction that it may be readily made by the unskilled without requiring expensive tooling.

Other and further objects of the present invention will appear from the following description of an illustrative embodiment of the same.

The miter box of the present invention is capable of various mechanical embodiments one oi which is shown in the accompanying drawings a and is described hereinafter for purposes of illustration. This illustrative embodiment of the present invention should in no way be construed as defining or limiting the same and reference should be had to the appended claims to determine the scope of the invention.

In the accompanying drawings, in which like reference characters indicate like parts, Fig. 1 is a view from above of an embodiment of the novel guide member used with the miter box of the present invention showing a portable power saw in position thereon; showing the means employed for adjusting the guide member for various sizes of portable power saws; and showing the slots employed for securing the guide member in various positions including the ripping position;

Fig. 2 is a cross sectional view of the guide member of Fig. 1 on the line 2-2 thereof;

Fig. 3 is a view from above of an embodiment of the miter box of the present invention with the novel guide member secured in position thereon for a cut across the length of the material to be cut and showing, in dotted lines, the guide member in position for a 45 cut across the length of the material to be cut;

Fig. 4 is a view from above of an illustrative embodiment of the miter box of the present invention with the guide member in position for ripping along the length of the material to be cut; and

Fig. 5 is an end view of the miter box of Fig. 4 with a portable power saw mounted in the guide member for ripping along the length of the material to be out.

Referring now more particularly to Figs. 1, 2 and 3, the illustrative embodiment of the miter box of the present invention there comprises a box of more or less conventional design made of any suitable material such as wood or metal and having a bottom It and side walls It and I 2. Side walls H and I2 are removably secured to the bottom It) as by lag bolts l3 provided with wing nuts to facilitate releasing and tightening these bolts. A plurality of closely spaced and aligned holes l3 are provided in side walls H and I2 for each of lag bolts l3, as seen in Fig. 5, so that the height of side walls H and I2 above the bottom Ill may be readily adjusted to determine the depth of cut of the saw blade in the material to be cut. Scales M are provided on the ends of walls II and I2 for an accurate determination of the heights of walls II and I2 above the base Ill.

Side wall I2 is provided with extensions 1 5 and I 6 for purposes which will more fully appear hereinafter. Extension i5 and the adjacent portion of side wall l2 are provided with a pair of internally threaded holes I1 and it which are aligned at right angles to the long axis of the miter box. Extension l6 and the adjacent por tion of side wall l2 are provided with internally threaded holes l9 and 23 aligned at right angles to the long axis of the miter box. I-Ioles ll, I8, I 9 and 20 are used to secure the saw guide mem her for ripping along the length of the miter box as shown in more detail in Fig. 4.

Side walls I l and I2 are provided with internally threaded holes 2| and 22 a plane common to the axes of which is aligned at a 45 angle to the long axis of the miter box. Side walls H and [2 are also provided with a pair of internally threaded holes 23 and 24 aligned at right angles to the long axis of the miter box and designed to ,is provided with a the guide member to the box.

p ate 6 2 provided hold the saw guide member for a 90 cut across the length of the material to be sawed. The top of side wall H is also provided with holes 25, 26, 21, and 28 which are aligned with hole 24 respectively at angles of 80, 70, 60 and 45 with the long axis of the miter box. The guide member for the power saw may therefore be pivoted about hole 24 and secured at each of the holes 25, 25, 21, and 2, 8 to provide cuts across the length of the material to be cut at angles of.80, '10", 60, and 45, respectively.

Side walls H and I2 and bottom ID are suitably slotted at 29, 30, 3|, 32, 33, 34 and 35 to permit passage of the saw blade through walls H and I2 and into bottom 10 for any of the angles at which the saw guide member may be set.

The guide member is shown in detail in Figs. 1 and 2. This guide 4 that extensions 50 and 53 lie ov'er' extensions [5 and [6 respectively. Slots 5| and 54 are arranged over holes l9 and and I1 and I8, respectively, so that wing bolts 65 and 66 may be screwed therein to secure the guide member to side wall [2. Scales 52 and 55 may be used to exactly position the saw blade 61 of the portable power saw 4| for any desired width of ripping cut.

When it is desired to cut at various angles agross thelength of the material to be sawed the guide frame is disposed across side walls H and 1 2, with a wing bolt 61 passing through either slot 56 or 51 in base plate 38 and into hole 24. The second wing bolt 68 is then passed through slots .51'or 58, as required, and into any of the holes 23, 25, 26, 21, and 28 to dispose the guide frame at for the-portable power saw member comprises anglernembers and 31"s'uitabl fissure-d a by We di g tQ base t a 3s respectivelyjthus forming a pair of tracks ithin i e ase lat .9 o an su t e po t e newer saw 4! ma sl de- The tra providedby allele memb rs .5 nd e" ecu e pe y to plates 35 and 3e are maintained in adjustable parallel relationshipby means of channels 42 and A3 iormed integrally with or otherwise suitably secured n an le membe 38 at pp te n thereof and at right angles to the long axis thereof. Bars 44 and are suitably secured at right angles to and at opposite ends of angle member 31 and base plate 39 and are received in channels '42 and 43 respectively. Bar-4e is slotted at M5 and bar 45 isslotted at 2 to receive wing bolts 8 and 9 respectively which are suitably threaded into the bottom of channels 42 and 43 respectively. By loosening wing bolts 48 and 4% an le, member 31 may be moved toward or away from angle member 36 to receive any width of base plate 40 of portable power saw 41.

Bar 44 is provided with an extension 50 which is suitably slotted at 5| and is provided with a suitable scale 52 for use when the guide member r ppingposition. Bar '45 is provided with a uitable extension 53 which is slotted at 54 and-is provided with a suitable scale 55, also for use when the guide member is in ripping position.

Base plateefiis provided with three longitudidisposed slots 56, 51, and 58 to receive the wing bolts employed in holding the guide member in position'for various angles of cut across the length of material to be sawed and base plate 39 I longitudinally disposed slot 58 which may be used with a clamping device to be described hereinafter, for additionally securing A suitable clamp -'for securing base plate as at any angular position of the guide member is shown generallyatffil'l in Figs. 1 and 3 and in detail in Fig. 2'. Referring more particularly to-Fig. 2 this clamp includes aheaded bolt 9| passing through slot' 59 and loosely supportingthereon a V with a curved extension 63 which is held on bolt 6| by wingnut '64. The curved portion 6-3 of plate 62 is hooked beneath the bottom edge of side I l and when wing nut 64 is tightened base plate 39 will be drawn into contact with the top of side ll.

Figs. 4 and 5 show the novel miter box of the present invention in position for ripping along the long axis of the material to be out. In this position the guide member is first adjusted for the width of the base plate '40 of the portable power saw 41, as described above, and is then placed upon sides H and 12 of-- the miter box so angles of 90 10,

60 and 45, respectively, withthe long axis of the miter box. Holes 2| and 22 are used for a reverse 45 angle of out. For these angles, and when required to prevent chattering, the clam-ping plate generallyindicatecl at "60 may be employed to secure base plate '39 to the top of side ll.

Most portable power saws are provided with means for adjusting the angularity'of the blade with respect to the base plate. Such a means is generally indicated in Figs. 1 and 5 at 69. Thus blade 61 may be angularly disposed at various angles with respect to-base plate 40. Thus the miter box of the present invention may be utilized not only for making right anglecuts both across the length of the material to be sawed and in ripping but may also be employed-to cutat various angles to the vertical both incross cutting and in ripping.

It will now be apparent that by the present invention a novel miter box is providedwhich in every way satisfies the several objects detailed above.

Changes in or-m'odiflcations to the above described illustrative embodiment of the miterbox of the present invention may now be suggested to those skilled in the art without departing from the present inventive concept. Reference should therefore be had to the appended claims to determine the scope of this invention.

What is claimed is:

1. In a miter box for portable power saws including an open top open ended box structure having a bottom and opposed side walls, a guide frame for the portable power saw disposed upon the tops. of the side walls having two opposed parallel track members to receive the power saw,

'means for holding said track members together in parallel relations-hip. including a bar at each end of one of said track members extending beyond said track member away from the, other track member, a longitudinal slot in each of said extensions, a lag bolt .passingthrough each of: said slots and into the top of oneof the side walls to hold said guide frame to said box structure'for ripping and a scale on each .of said extensions for adjusting said: frame with respect. tosaidibox 'long axis of the box structure, said means; for

securing said guide frame to the side walls ineluding longitudinal slots in one of said track members, lag bolts passing through said slots and threaded into the tops of the side walls, a longitudinal slot in the other track member, and a clamp engaging said last named slot and the lower edge of the adjacent side wall.

CHESTER, L. THAYER.

References Cited in the file of this patent UNITED STATES PATENTS Number Number 6 Name Date Bloodgood June 5, 1923 Howland Feb. 22, 1927 Earhart Nov. 17, 1931 Hess Sept. 25, 1951 Avery H May 6, 1952 

